TWI402428B - Duct - Google Patents

Description

Air duct

The present invention relates to an air duct, and more particularly to an air duct having an internal contraction.

Referring to Figure 1, a schematic perspective view of a conventional air duct for a blower fan is shown. The air duct 1 includes a body 11, a duct 12, an air inlet 13 and an air outlet 14. The air duct 1 is substantially flat. The body 11 is formed by a first side wall 111 , a second side wall 112 , a third side wall 113 , and a fourth side wall 114 , and the air duct 12 is formed inside the body 11 . The air inlet 13 and the air outlet 14 are respectively located at two ends of the body 11. The air inlet 13 is for receiving air from the outside (for example, a blower fan 10). The air outlet 14 is for exhausting air from the air inlet 13. The area of the air outlet 14 is larger than the area of the air inlet 13. The air duct 12 communicates with the air inlet 13 and the air outlet 14 , and the air inlet 13 is gradually expanded from the air inlet 13 to the air outlet 14 .

Referring to Figure 2, there is shown a flow diagram of a flow path inside a known air duct for a blower fan. The disadvantage of the air duct 1 is that the wind speed of the air outlet 14 is unevenly distributed in practical applications, and the air volume of the air outlet 14 is not large due to pipeline loss. When the blower fan 10 of model 12032 (the diameter of the impeller is 89.4 mm; the rotational speed is 4500 rpm) is the practical application object, the wind speed distribution of the air duct 1 at the air inlet 13 is the largest in the area A (about 22 m/s). , in descending order to area B (about 10m / s). When the air enters the air duct 12 of the air duct 1, the wind speed gradually becomes slow, wherein the wind speed in the area C is about 16 m/s, the wind speed in the area D is about 6 m/s, and the wind speed in the area E is about 2 m. /s. However, due to the shape of the air duct 12, the wind speed in the area F is even zero. Finally, the wind speed distribution of the air duct 1 at the air outlet 14 is: the area G is about 16 m/s, the area H is about 6 m/s, and the area I is about 2 m/s. Therefore, the wind speed distribution of the air outlet 14 is uneven. The air volume of the air outlet 14 is 58.8 CFM.

Therefore, it is necessary to provide an innovative and progressive air duct to solve the above problems.

The invention provides an air guiding duct, which comprises an air inlet, an air outlet and at least one inner opening. The air inlet is for receiving air from the outside. The air outlet is used to derive air from the air inlet, and the area of the air outlet is larger than the area of the air inlet. The indentation port is located between the air inlet and the air outlet, and the area of the indentation is smaller than the area of the air inlet. Thereby, the air from the air inlet is gradually tapered, and the air is gradually expanded after the inner air inlet, so that the wind speed distribution of the air outlet of the air duct is relatively uniform, and the pipeline loss can be reduced, and the air outlet is increased. Air volume.

Referring to Figures 3 and 4, a perspective view and a top plan view of the air duct of the present invention are respectively shown. The air duct 2 includes a body 21, a duct 22, an air inlet 23, an air outlet 24, and at least one inner recess 25.

The air inlet 23 is for receiving air from the outside (for example, a blower fan 20). In this embodiment, the air inlet 23 is used to connect a blower fan 20. However, it will be appreciated that the air duct 2 of the present invention can also be applied to other types of fans or other devices that generate wind.

The air outlet 24 is used to guide the air from the air inlet 23, and the area of the air outlet 24 is larger than the area of the air inlet 23. The retracting opening 25 is located between the air inlet 23 and the air outlet 24, and the area of the retracting opening 25 is smaller than the air inlet 23.

In the present embodiment, the air duct 2 is substantially flat. The body 21 is formed by a first sidewall 211 , a second sidewall 212 , a third sidewall 213 , and a fourth sidewall 214 , and the air duct 22 is formed inside the body 21 . The air inlet 23 and the air outlet 24 are respectively located at two ends of the body 21. The second side wall 212 has a concave portion 2121 which is arcuate, and the fourth side wall 214 is straight, so that the recessed portion 25 is formed between the concave portion 2121 and the fourth side wall 214.

The air duct 22 is located in the body 21 and communicates with the air inlet 23, the inner narrowing opening 25 and the air outlet 24 . The air duct 22 includes a first air duct 221 and a second air duct 222. The first air duct 221 communicates with the air inlet 23 and the inner narrowing port 25, and the first air duct 221 is tapered from the air inlet 23 to the inner narrowing opening 25. The second air duct 222 is connected to the inner narrowing opening 25 and the air outlet 24, and the second air duct 222 is gradually expanded from the inner narrowing opening 25 to the air outlet 24 .

The first air duct 221 has a first arc portion 2211, and the second air channel 222 has a second arc portion 2221. The first arc portion 2211 is connected to the second arc portion 2221, and the curvature of the first arc portion 2211 and the curvature of the second arc portion 2221 are continuous. That is, the recess 2121 forms the first arc portion 2211 and the second arc portion 2221.

In the present embodiment, the area of the indentation opening 25 is 0.2 to 0.99 times the area of the air inlet 23 . Preferably, the area of the constriction port 25 is 0.9 times the area of the air inlet port 23. Alternatively, the area of the constriction port 25 is 0.1 to 0.4 times the area of the air outlet 24. Preferably, the area of the inner constricting opening 25 is 0.2 times the area of the air outlet 24 . The distance L1 between the air inlet 23 and the retracting opening 25 is 0.05 to 0.4 times the distance L2 between the air inlet 23 and the air outlet 24. Preferably, the distance L1 between the air inlet 23 and the retracting opening 25 is 0.12 times the distance L2 between the air inlet 23 and the air outlet 24.

Referring to Figure 5, there is shown a schematic diagram of the flow field inside the air duct of the present invention. When the blower fan 20 of the model 12032 (the diameter of the impeller is 89.4 mm; the rotational speed is 4500 rpm) is the practical application object, the wind speed distribution of the air duct 2 at the air inlet 23 is the region J is the largest (about 22 m/s). , sequentially decreasing to the area K (about 10m / s). When the air enters the first air passage 221 of the air duct 2, since the first air duct 221 is tapered, there is an acceleration effect, wherein the wind speed in the area L is about 22 m/s, in the area M. The wind speed is about 18m/s. Thereafter, since the second air duct 222 is divergent, the wind speed gradually becomes slow, wherein the wind speed in the area N is about 8 m/s. Finally, the wind speed distribution of the air duct 2 at the air outlet 24 is: the area O is about 10 m/s, the area P is about 6 m/s, and the area Q is about 10 m/s. The air volume of the air outlet 24 is 67.0 CFM. Therefore, compared with the prior art, the wind speed distribution of the air outlet 24 of the air duct 2 is relatively uniform, and the pipeline loss can be reduced, and the air volume of the air outlet 24 is increased by 13.9. %.

The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims.

1. . . Conventional air duct

2. . . Air duct of the invention

10. . . Drum fan

11. . . Ontology

12. . . Wind tunnel

13. . . Air inlet

14. . . Air outlet

20. . . Drum fan

twenty one. . . Ontology

twenty two. . . Wind tunnel

twenty three. . . Air inlet

twenty four. . . Air outlet

25. . . Retraction

111. . . First side wall

112. . . Second side wall

113. . . Third side wall

114. . . Fourth side wall

211. . . First side wall

212. . . Second side wall

213. . . Third side wall

214. . . Fourth side wall

221. . . First air duct

222. . . Second air duct

2121. . . Concave

2211. . . First arc

2221. . . Second arc

Figure 1 shows a schematic perspective view of a conventional air duct for a blower fan;

Figure 2 is a schematic view showing a flow field inside a guide duct for a blower fan;

Figure 3 is a perspective view showing the air duct of the present invention;

Figure 4 is a top plan view showing the air duct of the present invention; and

Figure 5 is a schematic view showing the flow field inside the air duct of the present invention.

2. . . Air duct of the invention

20. . . Drum fan

twenty one. . . Ontology

twenty two. . . Wind tunnel

twenty three. . . Air inlet

twenty four. . . Air outlet

25. . . Retraction

211. . . First side wall

212. . . Second side wall

213. . . Third side wall

214. . . Fourth side wall

2121. . . Concave

Claims (12)

An air guiding duct includes: an air inlet for receiving air from the outside; an air outlet for guiding air from the air inlet, the air outlet having an area larger than an area of the air inlet; and at least one inner a shrinkage is located between the air inlet and the air outlet, the area of the inner shrinkage is smaller than the area of the air inlet; a body, the air inlet and the air outlet are respectively located at two ends of the body; and a wind a first air duct and a second air duct, the first air duct is connected to the air inlet and the inner air inlet, and has a first arc portion, the second air duct Connecting the inner constriction and the air outlet, and having a second arc portion, the first arc portion connecting the second arc portion, and the curvature of the first arc portion and the curvature of the second arc portion are continuous. The air duct of claim 1, wherein the air inlet is used to connect a blower fan. The air duct of claim 1, wherein the air duct is substantially flat. The air duct of claim 1, wherein the air duct comprises a first air duct and a second air duct, the first air duct is connected to the air inlet and the inner air inlet, and the first air duct is from the The tuyere to the indentation is tapered, and the second air duct is connected to the inner constriction and the air outlet, and the second air duct is divergent from the inner constriction to the air outlet. The air duct of claim 1, wherein the body has a recess, which is Arc shaped to form the constriction. The air duct of claim 1, wherein the body is sequentially surrounded by a first side wall, a second side wall, a third side wall and a fourth side wall, and the air duct is formed inside the body. The air inlet and the air outlet are respectively located at two ends of the body, and the second side wall has a concave portion which is arcuate to form the inner shrinking opening. The air duct of claim 1, wherein the area of the indentation is 0.2 to 0.99 times the area of the air inlet. The air duct of claim 7, wherein the area of the indentation is 0.9 times the area of the air inlet. The air duct of claim 1, wherein the area of the indentation is 0.1 to 0.4 times the area of the air outlet. The air duct of claim 9, wherein the area of the indentation is 0.2 times the area of the air outlet. The air duct of claim 1, wherein the distance between the air inlet and the air inlet is 0.05 to 0.4 times the distance between the air inlet and the air outlet. The air duct of claim 11, wherein the distance between the air inlet and the air inlet is 0.12 times the distance between the air inlet and the air outlet.